Why does ssh-add show what I type when run via ssh?

Question

When I do

$ ssh -A ssh.example.com ssh-add .ssh/id_rsa

it shows what I am typing when I type my passphrase.

Python is slightly more helpful about what's going on:

$ ssh ssh.example.com "python -c 'from getpass import getpass; print(getpass())'"
/usr/lib64/python3.6/getpass.py:91: GetPassWarning: Can not control
echo on the terminal.   passwd = fallback_getpass(prompt, stream)
Warning: Password input may be echoed.

Is there a way around this?

I can do stty -echo before I do the ssh command, but I'd be typing the command without seeing it.

Answer 1

You must use -t to emulate a terminal , so ssh-add can execute some tty settings to prevent the display of your password .

So in your case :

ssh -A -t ssh.example.com ssh-add .ssh/id_rsa